Question

1. What are differences between connective and epithelial tissues?
2. What is a similarity between nervous and muscle tissues?

Answer 1

Definition of Epithelium tissue

Epithelial cells are present in the arranged pattern, below the basement membrane. They get derived from embryological germ layers which can be from endoderm (e.g from the lining of the gastrointestinal tract), from mesoderm (e.g from the inner linings of body cavities), from ectoderm (e.g from the epidermis). Skin is one of its kind.

Definition of Connective tissue

These tissues have a wide networking of nerves and blood capillaries. These tissues connect, separate and support tissues and organs of the body. As these are enclosed within the matrix of elastic, cartilaginous and collagen tissue, fibroblast is the most common among all. Others are plasma cells, mast cells, adipocytes, leukocytes.

Basis for Comparison	Epithelial tissue	Connective tissue
Made up of	Cells and small amount of intercellular matrix.	Cells and a huge amount of intercellular matrix
Role	1.Mainly forms covering of the organs, internally and externally.	1.Support and anchors other tissue and organs.
2.Helps in transcellular or intercellular transportation.	2.Helps in muscles and bone formation.
3.In selective absorption, protection of cells.	3.Also helps in working of blood and lymph.
Develops from	It develops from the endoderm or mesoderm or ectoderm from the embryological germ layer.	Develops from mesoderm (embryonic mesodermal origin).
Arrangement	These cells are arranged in layers which can be either single or multi layer.	Here cells are present in scattered form in the matrix and does not show any arrangement.
Surrounded by	Does not surrounded by blood capillaries.	These cells are surrounded by blood capillaries.
Location	These tissues lie above the basement membrane.	These tissues lie below basement membrane, called lamina propia.
Nutrition	As epithelial cells are not bounded by blood capillaries and they gain their nutrition from the cellular membrane.	These types are bounded by blood capillaries and hence gain nutrition from there.
Bounded by	Special proteins, desmosomes and hemidesomes.	Blood capillaries and materials like elastic or collagen fibres.
Can be found	Lungs, kidneys, skin, mucous membranes.	Bones, nerves, ligaments, tendons, blood.

Similarity between nervous and muscle tissues:

• Muscular tissue and nervous tissue are two types of animal tissues.
• They are made up of cells.
• Moreover, both are present all over the body.